The RI E911 Exposure Assessment

The Rhode Island Shoreline Change Special Area Management Plan (RI Beach SAMP), a program supported by many partners accross the state, works to study and understand how RI’s coastal communities will be affected by flooding and erosion in the coming years, and to assist municipalities in planning how to protect both people and property from these changes. One of the goals of the Beach SAMP program is to generate new data that can be used by communities and individuals to plan for the future. One of their many projects is the RI e911 Exposure Assessment, which utilizes the E911 sites data published here on RIGIS.

Background on the E911 DataThe e911 sites data (as well as E911 Roads, Driveways, and Fire Hydrants) is updated on a quarterly basis through the RI Enhance 911 Uniform Emergency Telephone System contractor. The points contained within the “sites” data represent every structure within the state that has a known address. This powerful dataset also provides the foundation for the RIGIS Address Locator.

The RI e911 Exposure Assessment consists of 22 Excel workbooks that cover the following coastal flooding scenarios:

  1. Flooding from twice daily tides, based on sea level rise (SLR) projections to the year 2100
  2. Flooding from coastal storm events, both with and without SLR.

Each of Rhode Island’s 21 coastal communities has it’s own Excel workbook that can be downloaded from the RI e911 Exposure Assessment website (link above); there is also a statewide (coastal) Excel workbook, containing information on all 21 coastal communities, that can be downloaded. Contained within each Excel workbook, is information on:

  • Building description – what a site point represents
  • Number of Exposed Structures – number of structures exposed by water depths over 0 feet.
  • Total Structures by municipality – the total number of strutures within a town
  • Total Structures SLR7, 100YR – the total number of structures exposed in the worst case scenario (SLR 7 feet with 100 year storm surge)
  • Percent Municipality – percent of exposed structures out of the total number of structures within the town
  • Percent SLR7, 100YR – pwercent of structures exposed during worst case scenario
  • 0-2 ft, 2-4 ft, 4-6 ft, >6 ft (each contained within a separate column) – total number of structures exposed at each interval (see project page for more details on this)
  • Mean Elevation – mean elevation of water for exposted structures in a town
  • Min/Max ft (each contained within a separate column) – the minimum and maximum level (in feet) of water for exposed structures within a town

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